Water-impermeable polyolefin foam and process for preparing the

Details Water-impermeable polyolefin foam and process for preparing the Water-impermeable polyolefin foam and process for preparing the

1982-09-29

1983-11-15

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 264DIG9, 264DIG18, 521 60, 521 59, C08J 924

Patent

active

044156804

ABSTRACT:
A substantially water-impermeable polyolefin foam made of expandable polyolefin beads. The polyolefin foam is prepared by a particular process in which after heating expandable polyolefin beads and before cooling the heated beads in a mold, the heated beads were allowed to stand in the state that the polyolefin resin maintains the flowability.

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patent: 4108934 (1978-08-01), Rubens et al.
patent: 4247650 (1981-01-01), Shmizu et al.
patent: 4275023 (1981-06-01), Shmizu et al.

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